Systems, methods, and computer readable storage device for delivering power to tower equipment

ABSTRACT

A cell site includes a tower and a power over Ethernet system to power devices on the tower. The power over Ethernet system includes a power over Ethernet switch and a multiplexing box. Ethernet cables connect output ports of the power over Ethernet switch to input ports of the multiplexing box. A power plant is connected to the input of the power over Ethernet switch. Devices are connected to the output ports of the multiplexing box. The power over Ethernet system also includes a power management control.

CROSS REFERENCE TO RELATED APPLICATIONS

The present U.S. Utility Patent Application claims priority pursuant to35 U.S.C. §121 as a divisional of U.S. Utility application Ser. No.14/107,057, entitled “SYSTEMS, METHODS, AND COMPUTER READABLE STORAGEDEVICE FOR DELIVERING POWER TO TOWER EQUIPMENT”, filed Dec. 16, 2013,which is hereby incorporated herein by reference in its entirety andmade part of the present U.S. Utility Patent Application for allpurposes.

TECHNICAL FIELD

The present disclosure relates generally to delivering power to towerequipment.

BACKGROUND

Equipment such as remote radio heads (RRHs) are installed at the top ofcell towers. Each RRH requires direct current (DC) to power the RRH. Tosupply DC, a dedicated DC cable runs directly from the power plant onthe ground to the RRH. In order to compensate for voltage drop, a biggergauge of DC cable is used.

This type of installation is expensive. One reason is that the size andweight of DC cables may require to the tower structure to be modified.Another reason is that DC surge protection is required at tower top toprotect against lightning strikes. In general, larger cables with highercurrent carrying capacity require a higher level of surge protection.Yet another reason is that the DC cables are made of copper, which isexpensive because it is prone to theft. Copper theft is expensive notonly because of the material and labor costs but also because of thecost of lost service due to a broken site. Lost service has largeimpacts on networks.

Cellular operators have been hit in the recent years with copper theft.Several towers are located in uninhabited areas and it is easy toextract copper from cables. Operators are responding by adding securitygates/wires and by adding surveillance cameras.

SUMMARY

It should be appreciated that this Summary is provided to introduce aselection of concepts in a simplified form, the concepts being furtherdescribed below in the Detailed Description. This Summary is notintended to identify key features or essential features of thisdisclosure, nor is it intended to limit the scope of the presentdisclosure.

According to an illustrated embodiment, a system includes PoE (Powerover Ethernet) or equivalent architecture. The PoE system lowers cablecosts, surge protection costs, leasing costs, discourages theft, andfacilitates trunking efficiency.

PoE cables have much thinner conductors and thus require low capacity,low cost surge protectors. Several smaller surge protectors are cheaperthan one large high capacity surge protectors.

PoE cables discourage theft because they have thin copper and heavy PVCcladding, which makes for a very labor intensive process to extractcopper.

Further, the PoE system provides trunking efficiency. Traffic is spreadout in time and intensity between different sectors. The PoE system isconfigured to carry less than peak achievable load and to distribute theload over the sectors. The PoE system has a lower average powerrequirement at any given time period.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a cell site according to an illustrative embodiment.

FIG. 2 illustrates a schematic of features of the cell site of FIG. 1.

FIG. 3 illustrates a schematic of a computing device for controllingpower to the cell site of FIG. 2 according to an illustrativeembodiment.

FIG. 4 illustrates a graph of power consumption over time of a remoteradio head of the cell site of FIG. 2, according to an illustrativeembodiment.

FIG. 5 illustrates a bar graph of actual DC consumption and predicted DCconsumption of remote radio heads of the cell site of FIG. 2, accordingto an illustrative embodiment.

FIG. 6 illustrates a bar graph of the total actual DC consumption andtotal predicted DC consumption associated with remote radio heads of thecell site of FIG. 2, according to an illustrative embodiment.

FIG. 7 illustrates a method for controlling power to a cell siteaccording to an illustrative embodiment.

DETAILED DESCRIPTION

Detailed illustrative embodiments are disclosed herein. It must beunderstood that the embodiments described and illustrated are merelyexamples that may be embodied in various and alternative forms, andcombinations thereof. As used herein, the word “illustrative” is usedexpansively to refer to embodiments that serve as examples orillustrations. The figures are not necessarily to scale and somefeatures may be exaggerated or minimized to show details of particularcomponents. Specific structural and functional details disclosed hereinare not to be interpreted as limiting.

Illustrative embodiments are discussed with respect to delivering DC topower remote radio heads (RRHs). The teachings are applicable todelivering DC to power other devices including tower mounted amplifiers,integrated antennas (i.e., antenna with integrated radio unit),combinations thereat and the like. For example, excess DC at the top ofthe tower can be sold through leasing agreements to power devices thatare not part of a wireless network or to other wireless networks.

Although the description that follows discusses a cell tower, thedisclosure is not limited to this case. For example, the disclosure mayalso be applicable to water towers, other tall structures, and the like.

Cell Site FIG. 1

According to an illustrative embodiment, a cell site 10 includes amonopole cell tower 12 and a hatch plate 14 near the base of the tower12. The tower 12 includes equipment near the top of the tower 12including a first set of antennas 20, a second set of antennas 30, and aset of remote radio heads (RRH) 40 (also referred to as a remote radiounits (RRU)). The hatch plate 14 includes a direct current (DC) powerplant 50 (e.g., power supply) and a baseband unit (BBU) 60. Inalternative illustrated embodiments, the hatch plate includes more thanone BBU. A power over Ethernet (PoE) system 70 connects the power plant50 to the set of RRHs 40, as described in further detail below.

Each of the first and second sets of antennas 20, 30 is positioned at ornear the top of the tower 12. For example, the cell tower is 100-200feet tall to vertically position the first and second sets of antennas20, 30.

The first and second sets of antennas 20, 30 include subsets of antennasthat are associated with a sector. For example, each of three subsets ofantennas is associated with a one hundred twenty degree angle sector. Asubset of antennas can include a single antenna or a group of antennassuch as a group of two, a group of three, or a group of four. Theillustrated first set of antennas 20 includes three antennas associatedwith each of three sectors and the illustrated second set of antennas 30includes two antennas associated with each of three sectors.

Higher frequency antennas are generally shorter. For example, theantennas of the first set of antennas 20 support higher frequencies thanthe antennas of the second set of antennas 30.

Each of the antennas of the first set of antennas 20 and the second setof antennas 30 is configured to transmit and receive radio waves. Forexample, radio waves are transmitted to a handset (e.g., cell phone ormobile device) and are received from the handset.

The set of RRHs 40 and the BBU 60 provide a distributed radio system.Each of the set of RRHs 40 is configured to perform RF processing (e.g.,analog radio functions) and the BBU 60 is configured to perform basebandprocessing (e.g., digital radio functions). The RRH includes RFcircuitry, analog-to-digital/digital-to-analog converters, and up/downconverters. The RRH is connected to the BBU via optical fiber.

Cell Site FIG. 2

Referring to FIG. 2, the cell site 10 is described in further detailwith respect to certain of the set of RRHs 40 that are associated withand the second set of antennas 30.

Antennas

The second set of antennas 30 includes a first antenna subset 100, asecond antenna subset 110, and a third antenna subset 120. For example,each antenna subset is associated with a different sector. The antennasubsets 100, 110, 120 can include various types of antennas includingcross pollination antennas, vertical pollination antennas, horizontalpollination antennas, combinations thereof, and the like. For example,the antenna subsets 100, 110, 120 can include antennas that areperpendicular to one another and are aligned at a plus or minus fortyfive degree angle with respect to the vertical or horizontal plane.

Each of the antenna subsets 100, 110, 120 includes a remote electricaltilt (RET) unit 160, 170, 180 that is configured to adjust the tiltangle of a respective one of the antenna subsets 100, 110, 120. Theantenna subsets 100, 110, 120 are tilted to aim a main lobe of thevertical plane radiation pattern of an antenna. For example, a remoteelectrical tilt (RET) unit includes RET motors that are configured toaccurately tilt the antenna subsets. The RET motors are controlled froma controller, for example, in the hatch plate 14 or from a remotenetwork management center (not shown).

RRHs

The set of RRHs 40 includes a first RRH 200, a second RRH 210, a thirdRRH 220, a fourth RRH 230, a fifth RRH 240, and a sixth RRH 250. EachRRH 200, 210, 220, 230, 240, 250 includes first and secondtransmit/receive ports (e.g., TX1/RX1, TX2/RX2).

The antenna subset 100 is connected to a first transmit/receive port 272of the first RRH 200, a second transmit/receive port 274 of the firstRRH 200, a first transmit/receive port 276 of the second RRH 210, and asecond transmit/receive port 278 of the second RRH 210.

The antenna subset 110 is connected to a first transmit/receive port 280of the third RRH 220, a second transmit/receive port 282 of the thirdRRH 220, a first transmit/receive port 284 of the fourth RRH 230, and asecond transmit/receive port 286 of the fourth RRH 230.

The antenna subset 120 is connected to a first transmit/receive port 288of the fifth RRH 240, a second transmit/receive port 290 of the fifthRRH 240, a first transmit/receive port 292 of the sixth RRH 250, and asecond transmit/receive port 294 of the sixth RRH 250.

In alternative embodiments, an RRH is integrated into an antenna orantenna subset and the radio functionality is distributed across theantenna elements (e.g., an “active antennae”).

Demarcation Box

The cell site 10 further includes a demarcation box 300. The demarcationbox 300 includes a fiber management structure 310. A fiber trunk 320connects the BBU 60 to the fiber management structure 310. Fiber cablesrun through the fiber trunk 320.

Fiber jumper cables 330, 332, 334, 336, 338, 340 run from the fibermanagement structure 310 to a respective one of the RRHs 200, 210, 220,230, 240, 250. For example, the fiber jumper cables 330, 332, 334, 336,338, 340 connect to a common public radio interface (CPRI) 350, 352,354, 356, 358, 360 of a respective one of the RRHs 200, 210, 220, 230,240, 250.

Power Over Ethernet

The PoE system 70 is configured to supply DC from the power plant 50 tothe demarcation box 300, where it is then distributed to the RRHs 200,210, 220, 230, 240, 250. Particularly, the PoE system 70 includes a PoEswitch 400, Ethernet cables 410 (e.g., combined in a flat ribbon cable),a multiplexing box 412 including an aggregation box 420 and adistribution box 430, and a management control 460. The demarcation box300 includes the multiplexing box 412.

DC jumper cables 440, 442, 444, 446, 448, 450 (e.g., each DC jumpercable includes a pair of cables) connect the distribution box 430 to theRRHs 200, 210, 220, 230, 240, 250. In alternative illustratedembodiments, a number of Ethernet cables connect the distribution box tothe RRHs.

The power plant 50 is connected to an input of the PoE switch 400.Output ports of the PoE switch 400 are connected to input ports of theaggregation box 420 by the Ethernet cables 410 (e.g., RJ45 cables). Forpurposes of illustration, the PoE switch 400 includes N.sub.p(total)output ports and N. sub.c Ethernet cables 410 are connected to theoutput ports.

The output of the aggregation box 420 is the sum of the DC through theEthernet cables 410 and is input to the distribution box 430. Outputconnections of the distribution box 430 are connected to DC inputconnections of the RRHs 200, 210, 220, 230, 240, 250 by the DC jumpercables 440, 442, 444, 446, 448, 450.

The power management control 460 is configured to control thedistribution box 430 and the PoE switch 400. The illustrated powermanagement control 460 is remotely connected to each of the distributionbox 430 and the PoE switch 400 over interact connections 462, 464.Alternatively, the power management control 460 is directly connected tothe distribution box 430 and the PoE switch 400. Although the locationof the power management control 460 is illustrated as remote from thefeatures of the cell site 10, the power management control 460 can belocated at the cell site 10. For example, the power management control460 can be located in the hatch plate 14, in the demarcation box 300,and the like. The power management control 460 may be implemented with acomputing device, such as that illustrated in FIG. 3.

As described in further detail below, the power management control 460is configured to adapt the number of open ports N_(p)(open) of the PoEswitch 400 to the total predicted DC consumption P_(t) of the RRHs 200,210, 220, 230, 240, 250.

Power Management Control FIG. 3

Referring to FIG. 3, the power management control 460 includes acomputing device. The computing device includes a processor 500 forcontrolling and/or processing data, input/output (I/O) data ports 502,and a memory 510.

The processor can be multiple processors, which could includedistributed processors or parallel processors in a single machine ormultiple machines. The processor could include virtual processor(s). Theprocessor could include a state machine, application specific integratedcircuit (ASIC), programmable gate array (PGA) including a Field PGA, orstate machine. When a processor executes instructions to perform“operations”, this could include the processor performing the operationsdirectly and/or facilitating, directing, or cooperating with anotherdevice or component to perform the operations.

The computing device can include a variety of computer-readable media,including volatile media, non-volatile media, removable media, andnon-removable media. The term “computer-readable media” and variantsthereof, as used in the specification and claims, includes storagemedia. Storage media includes volatile and/or non-volatile, removableand/or non-removable media, such as, for example, RAM, ROM, EEPROM,flash memory or other memory technology, CDROM, DVD, or other opticaldisk storage, magnetic tape, magnetic disk storage, or other magneticstorage devices or any other medium that is configured to be used tostore information that can be accessed by the computing device.

While the memory 510 is illustrated as residing proximate the processor500, it should be understood that at least a portion of the memory canbe a remotely accessed storage system, for example, a server on acommunication network, a remote hard disk drive, a removable storagemedium, combinations thereof, and the like. Thus, any of the data,applications, and/or software described below can be stored within thememory and/or accessed via network connections to other data processingsystems (not shown) that may include a local area network (LAN), ametropolitan area network (MAN), or a wide area network (WAN), forexample.

The memory 510 includes several categories of software and data used inthe computing device, including, applications 520, a database 530, anoperating system (OS) 540, and input/output (110) device drivers 550.

As will be appreciated by those skilled in the art, the OS 540 may beany operating system for use with a data processing system. The I/Odevice drivers 550 may include various routines accessed through the OS540 by the applications to communicate with devices, and certain memorycomponents. The applications 520 can be stored in the memory 510 and/orin a firmware (not shown) as executable instructions, and can beexecuted by the processor 500.

The applications 520 include various programs that, when executed by theprocessor 500, implement the various features of the power managementcontrol 460. The applications 520 include a power optimizationapplication. The power optimization application includes computerreadable instructions that, when executed by the processor 500, causethe processor 500 to perform operations for controlling power to a cellsite as part of a control method 600 described in further detail below.The applications 520 are stored in the memory 510 and are configured tobe executed by the processor 500.

The applications 520 may be applied to data stored in the database 530,such as the actual and predicted DC consumption of the RRHs along withdata, e.g., received via the I/O data ports 502. The database 530represents the static and dynamic data used by the applications 520, theOS 540, the I/O device drivers 550 and other software programs that mayreside in the memory 510.

It should be understood that FIG. 3 and the description above areintended to provide a brief, general description of a suitableenvironment in which the various aspects of some embodiments of thepresent disclosure can be implemented. The terminology“computer-readable media”, “computer-readable storage device”, andvariants thereof, as used in the specification and claims, can includestorage media. Storage media can include volatile and/or non-volatile,removable and/or non-removable media, such as, for example, RAM, ROM,EEPROM, flash memory or other memory technology, CDROM, DVD, or otheroptical disk storage, magnetic tape, magnetic disk storage, or othermagnetic storage devices or any other medium, excluding propagatingsignals, that can be used to store information that can be accessed bythe computing device shown in FIG. 3.

While the description refers to computer-readable instructions,embodiments of the present disclosure also can be implemented incombination with other program modules and/or as a combination ofhardware and software in addition to, or instead of, computer readableinstructions.

The term “application,” or variants thereof, is used expansively hereinto include routines, program modules, programs, components, datastructures, algorithms, and the like. Applications can be implemented onvarious system configurations, including single-processor ormultiprocessor systems, minicomputers, mainframe computers, personalcomputers, hand-held computing devices, microprocessor-based,programmable consumer electronics, combinations thereof, and the like.

Traffic Load (Power Consumption) and Power Supply FIG. 4-6

Actual DC consumption A can be determined by measuring of one or moreparameters including voltage, traffic load, power, and the like. Forpurposes of illustration, traffic load is described in further detail.

Traffic load varies over time and by sector. Actual DC consumption A ofeach RRH 200, 210, 220, 230, 240, 250 is based on the associated trafficload. For example, at a time when the traffic load is heavy in a sector,the RRH associated with that sector consumes more DC to support moreactive links. For example, FIG. 4 illustrates actual DC consumption A ofan RRH 200, 210, 220, 230, 240, 250 over time. Measurements of actual DCconsumption A over time can be used to calculated predicted DCconsumption P, as described in further detail below.

Actual DC consumption A can be determined by measuring a traffic loadand converting the traffic load to DC consumption. For example, agenerally linear model can be used to convert traffic load to powerconsumption and then to DC consumption. The traffic load is measured,for example, by a network monitoring tool (not shown) and the networkmonitoring tool transfers the information to the power managementcontrol 460. Alternatively, for purposes of illustration, the powermanagement control 460 is remotely or directly connected to each RRH200, 210, 220, 230, 240, 250 to receive the traffic load or the DCconsumption of each RRH 200, 210, 220, 230, 240, 250.

FIG. 5 illustrates, for each RRH 200, 210, 220, 230, 240, 250, predictedDC consumption P and actual DC consumption A at an instant in time. FIG.6 illustrates the total predicted DC consumption P_(t) and the totalactual DC consumption A_(t) by the RRHs 200, 210, 220, 230, 240, 250 atan instant in time.

The total predicted DC consumption P_(t) for the RRHs 200, 210, 220,230, 240, 250 is determined to exceed the total actual DC consumptionA_(t) by the RRHs 200, 210, 220, 230, 240, 250, for example, to providea low probability of call blocking or call dropping. For example,referring to FIG. 5, the actual DC consumption A of the RRHs 200, 210,220, 230, 240, 250 can be greater than the predicted DC consumption P ofa respective one of the RRHs 200, 210, 220, 230, 240, 250 so long as, inaggregate, referring to FIG. 6, the total predicted DC consumption P_(t)of the RRHs 200, 210, 220, 230, 240, 250 is greater than the totalactual DC consumption A.sub.t of the RRHs 200, 210, 220, 230, 240, 250.The overprediction of the DC consumption of certain of the RRHs (e.g.,RRHs 200, 210, 230, 250) can be used to compensate for theunderprediction of the DC consumption of other of the RRHs (e.g., RRHs220, 240). Calculation of the total predicted DC consumption P_(t) isdescribed in further detail below.

Method/Application FIG. 7

The power management control 460 is configured to adapt the number ofopen ports N_(p) to the DC consumption of the RRHs 200, 210, 220, 230,240, 250. In doing so, the power management control 460 is configured tominimize the DC to the RRHs 200, 210, 220, 230, 240, 250. For example,the power management control 460 minimizes the number of open portsN.sub.p of the PoE switch 400 based on actual total DC consumption A_(t)or predicted total DC consumption P_(t).

The power management control 460 includes, among the applications 520, apower optimization application. The power optimization applicationincludes computer readable instructions that, when executed by theprocessor 500, cause the processor 500 to perform operations forcontrolling power to a cell site as part of a control method 600.

Referring to FIG. 7, according to a first step 610 of the method 600,the processor 500 accesses, receives, or calculates the predicted DCconsumption P of each RRHs 200, 210, 220, 230, 240, 250 at a time t(e.g., see FIG. 5). Predicted DC consumption P can be determined usingreal-time or past data (e.g., statistically determined) of one or moreparameters including voltage, traffic, power, and the like.

Referring to FIG. 4, according to some embodiments, predicted DCconsumption P is a maximum measured DC consumption of an RRH at arecurring time t (see P₁ in FIG. 4). According to some embodiments,predicted DC consumption P is actual DC consumption A plus a factor ofsafety (see P₂ in FIG. 4). According to some embodiments, the predictedDC consumption P is the actual DC consumption A and the calculation isdone in real time.

The total predicted DC consumption P_(t) is equal to a number of openports N_(p)(open) of the PoE switch 400 multiplied by the DC througheach open port (e.g., as determined by the properties of the Ethernetcables 410). Referring to FIG. 6, the distance between adjacent hashmarks on the y-axis represent the DC through output ports of the PoEswitch 400.

According to a second step 620 of the method 600, to determine the totalpredicted DC consumption P_(t), the processor 500 determines anapproximated total predicted DC consumption P_(tx). The approximatedtotal DC consumption P_(tx) is equal to the sum of the predicted DCconsumption P for the RRHs 200, 210, 220, 230, 240, 250.

According to a third step 630 of the method 600, the processor 500determines the total predicted DC consumption P_(t) by calculating theminimum number of open ports N_(p)(open) of the PoE switch 400 thatcombine to provide DC that is greater than the approximated totalpredicted DC consumption P_(tx). The total predicted DC consumptionP_(t) is the DC provided by the minimum number of open ports N_(p)(open)of the PoE switch 400.

According to a fourth step 640 of the method 600, the processor 500generates a signal to set the status of the ports of the PoE switch 400and the control sends the signal to the PoE switch 400 to implement thestatus of the ports.

It should be understood that the steps or other interactions of theillustrated method are not necessarily presented in any particular orderand that performance of some or all the steps in an alternative order ispossible and is contemplated. The steps have been presented in thedemonstrated order for ease of description and illustration. Steps canbe added, omitted and/or performed simultaneously without departing fromthe scope of the appended claims. It should also be understood that themethod can be ended at any time. In certain embodiments, some or allsteps of the method, and/or substantially equivalent steps can beperformed by execution of computer-executable instructions stored orincluded on a computer-readable medium.

The law does not require and it is economically prohibitive toillustrate and teach every possible embodiment of the present claims.Hence, the above-described embodiments are merely illustrations ofimplementations set forth for a clear understanding of the claimedsubject matter. Variations, modifications, and combinations may be madeto the above-described embodiments without departing from the scope ofthe claims. All such variations, modifications, and combinations areincluded herein by the scope of this disclosure and the followingclaims.

What is claimed is:
 1. A method, comprising: determining, by aprocessor, a total predicted direct current consumption as a sum of apredicted direct current consumption of each of a plurality of remoteradio heads; and determining, by the processor, a minimum number of openports of a power over Ethernet switch that combine to provide directcurrent that is greater than the total predicted direct currentconsumption.
 2. The method of claim 1, further comprising: adapting, bythe processor, a number of open ports of the power over Ethernet switchto the total predicted direct current consumption of the plurality ofremote radio heads.
 3. The method of claim 1, wherein the predicteddirect current consumption is determined using real-time or past data ofone or more parameters including voltage, traffic, and power.
 4. Themethod of claim 1, wherein the predicted direct current consumption ofeach of the plurality of remote radio heads includes at least one of: amaximum measured direct current consumption of one of the plurality ofremote radio head at a recurring time; an actual direct currentconsumption of one of the plurality of remote radio heads plus a factorof safety; and an actual direct current consumption of one of theplurality of remote radio heads.
 5. The method of claim 1, wherein thepredicted direct current consumption is based on actual direct currentconsumption.
 6. The method of claim 1, wherein the predicted directcurrent consumption includes a maximum measured direct currentconsumption of one of the plurality of remote radio heads at a recurringtime.
 7. The method of claim 1, wherein the predicted direct currentconsumption includes an actual direct current consumption of at leastone of the plurality of remote radio heads plus a factor of safety. 8.The method of claim 1, wherein the predicted direct current consumptionincludes an actual direct current consumption of at least one of theplurality of remote radio heads.
 9. The method of claim 1, furthercomprising generating, by the processor, a signal that is configured toset the open or closed status of the ports of the power over Ethernetswitch, based on the total predicted direct current consumption of theplurality of remote radio heads.
 10. The method of claim 9, furthercomprising sending, by the processor, the signal to the power overEthernet switch to implement the open or closed status of the ports. 11.A computer-readable storage device having instructions stored thereonwhich, when executed by a processor, cause the processor to performoperations comprising: determining an approximated total predicteddirect current consumption as a sum of a predicted direct currentconsumption of each of a plurality of remote radio heads; determining aminimum number of open ports of a power over Ethernet switch thatcombine to provide a direct current that is greater than theapproximated total predicted direct current consumption.
 12. Thecomputer-readable storage device of claim 11, wherein the operationsfurther comprise: adapting, by the processor, a number of open ports ofthe power over Ethernet switch to the total predicted direct currentconsumption of the plurality of remote radio heads.
 13. Thecomputer-readable storage device of claim 11, wherein the predicteddirect current consumption is determined using real-time or past data ofone or more parameters including voltage, traffic, and power.
 14. Thecomputer-readable storage device of claim 11, wherein the predicteddirect current consumption is based on actual direct currentconsumption.
 15. The computer-readable storage device of claim 11,wherein the predicted direct current consumption includes a maximummeasured direct current consumption of one of the plurality of remoteradio heads at a recurring time.
 16. The computer-readable storagedevice of claim 11, wherein the predicted direct current consumptionincludes an actual direct current consumption of at least one of theplurality of remote radio heads plus a factor of safety.
 17. Thecomputer-readable storage device of claim 11, wherein the predicteddirect current consumption includes an actual direct current consumptionof at least one of the plurality of remote radio heads.
 18. Thecomputer-readable storage device of claim 11, wherein the operationsfurther comprise: generating a signal that is configured to set the openor closed status of the ports of the power over Ethernet switch, basedon the total predicted direct current consumption of the plurality ofremote radio heads.
 19. The computer-readable storage device of claim18, wherein the operations further comprise: sending the signal to thepower over Ethernet switch to implement the open or closed status of theports.
 20. A method, comprising: determining, by a processor, a totalpredicted direct current consumption as a sum of a predicted directcurrent consumption of each of a plurality of remote radio heads of acell site; and determining, by the processor, a minimum number of openports of a power over Ethernet switch associated with the cell site,wherein the number of open ports combine to provide direct current thatis greater than the total predicted direct current consumption.